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Title: Influence Of Decarburization On The Fatigue Behaviour Of Shot Peened Spring Steels
Author: DALAEI, HÖIJER, ÅKERSTRÖM, KARLSSON & SVENSSON
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008081
Number of pages: 6
Abstract:
ABSTRACT
The influence of decarburization on the high cycle fatigue behaviour of shot peened spring steel was investigated. The material studied was a quenched and tempered carbon
steel (0.55C, 1.9Si and 0.9 Mn). The specimens were decarburized to depths of 0.40 and 0.50 mm. Shot peening with full coverage then took place, leading to a thickness of
the compressed surface layer of about 0.25 mm. The specimens were
tested in bending fatigue to fatigue lives in the range Nf = 1·105 to 3·106 cycles. Following fatigue limits were then achieved: 655 – 675 MPa for the two decarburized
levels and 880 MPa for the non-decarburized specimens. Crack nucleation generally took place in the very surface zone. Stress relaxation during fatigue loading and surface
roughness of the specimens were measured and correlated to the fatigue behaviour.
KEY WORDS Decarburization, fatigue strength, residual stresses, shot peening.
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This page last revised: 03/22/2010